24 Questions
What happens to the bonds in the reactants during a chemical reaction?
They break
What is the energy required to break a bond called?
Bond energy
What is the concept that measures the total energy of a chemical system at a given pressure?
Enthalpy
What type of reaction releases energy because the energy required to break bonds in the reactants is less than the energy released when new bonds form in the products?
Exothermic reaction
What is the change in enthalpy (ΔH) during a reaction an indication of?
Whether the reaction absorbs or releases energy
What type of reaction absorbs energy because the energy required to break bonds in the reactants is more than the energy released when new bonds form in the products?
Endothermic reaction
What is the result of the energy required to break bonds in the reactants being less than the energy released when new bonds form in the products?
Energy is released
What is the representation of an exothermic reaction?
Reactants → Products + Energy
What is the primary reason for energy changes in chemical reactions?
Breaking of bonds in the reactants
What is the term used to describe the energy needed to break a chemical bond between two atoms?
Bond dissociation energy
Which of the following statements is true about exothermic reactions?
The energy of the products is lower than the energy of the reactants
What is the result of the energy required to break bonds in the reactants being equal to the energy released when new bonds form in the products?
No net energy change occurs
Which type of reaction would occur if the energy required to break bonds in the reactants is significantly less than the energy released when new bonds form in the products?
Exothermic reaction
What is the primary difference between exothermic and endothermic reactions?
The direction of energy flow
Which of the following reactions would require energy input from the surroundings?
Endothermic reaction
What is the term used to describe the total energy of a chemical system at a given pressure?
Enthalpy
What is the primary cause of energy changes in a chemical reaction?
The breaking and formation of chemical bonds
Which of the following is NOT a characteristic of an exothermic reaction?
The reaction absorbs energy from the surroundings
What is the relationship between bond energy and the energy required to break a bond?
Bond energy is the energy required to break a bond
In an endothermic reaction, what is the relationship between the energy required to break bonds and the energy released when new bonds form?
The energy required to break bonds is more than the energy released when new bonds form
What is the purpose of considering enthalpy (H) in chemical reactions?
To calculate the total energy of the chemical system at a given pressure
In which type of reaction is the energy of the products higher than the energy of the reactants?
Endothermic reaction
What is the result of the energy required to break bonds in the reactants being exactly equal to the energy released when new bonds form in the products?
No energy change occurs
Which of the following is a characteristic of both exothermic and endothermic reactions?
Bonds in the reactants break and new bonds form in the products
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